ethyl 1,3-dioxo-2-phenyl-1,2,3,4-tetrahydroisoquinoline-4-carboxylate

N-phenyl-3-hydroxyisobenzofuran-1-one-3-carbamide

2-anilinooxalyl-benzoic acid

2-(羧基羰基)苯甲酸

(8ci,9ci)-1H-2-苯并吡喃-1,3,4-三酮